Dear Mr. Schumann,
Thank you for posting your request on History Hub!
The indexes for the Works Progress Administration project files are not digitized yet or available online. You may view the three Nation Archives Microfilm Publications Nos. T935, T936 & T937 in the Microfilm Reading Room (Room 4050) at the National Archives in College Park, MD. Reading room hours are 8:45 a.m. to 5:45 p.m. Monday through Friday, except legal holidays. Prior to your visit, please consult the National Archives at College Park website at https://www.archives.gov/dc-metro/college-park/.
We hope this is helpful. Best of luck with your research!